Zooming out a map increments the rework penalty of it

In Pocket Edition maps can only be zoomed out with anvils. This is because the PC crafting system is not available in it. However, using anvils to zoom out a map increments the rework penalty, which renders renaming it after zooming out an unreasonably costly operation.

Steps to reproduce:

1. Create a map
2. Zoom it out to the maximum (4 times)
3. Rename it

What expected:
Renaming only requires 1 xp level.

What actually happens:
It requires 16 xp levels, i.e. 15 rework penalty + 1 renaming cost.